Use a colon in the stream description, this matches how -map works now.

libavformat/utils.c

@@ -3462,7 +3462,7 @@ static void dump_stream_format(AVFormatContext *ic, int i, int index, int is_out
     int g = av_gcd(st->time_base.num, st->time_base.den);
     AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
     avcodec_string(buf, sizeof(buf), st->codec, is_output);
-    av_log(NULL, AV_LOG_INFO, "    Stream #%d.%d", index, i);
+    av_log(NULL, AV_LOG_INFO, "    Stream #%d:%d", index, i);
     /* the pid is an important information, so we display it */
     /* XXX: add a generic system */
     if (flags & AVFMT_SHOW_IDS)